lance armstrong doped for most of his career. armstrong told oprah winfrey in an exclusive interview that he used performance enhancers in not just one but all seven of his tour de france victories. he said it was part of a doping culture and in his view leveled the playing field. >> you said we had one ambition to win the greatest bike race. not to just win once, but to keep on winning it and to win it, you had to keep using banned substances to do it. >> yes. but -- i'm not sure this is an acceptable answer, but that's like saying we have to have air in our tires. or we have to it have water in our bottles. >> armstrong did say that he was not doping when had he made a comeback to the tour in 2010. he placed third that year. following the interview, armstrong's cap certificate foundation, living strong, released a statement saying "we are disappointed by the news that lance armstrong misled people during and after his cycling career, including us. lance apologized to our staff and we accepted his apology in order to move on." t